CN104724779A - Clean flue gas recycling type desulfurization waste water spraying system - Google Patents

Clean flue gas recycling type desulfurization waste water spraying system Download PDF

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Publication number
CN104724779A
CN104724779A CN201510167296.0A CN201510167296A CN104724779A CN 104724779 A CN104724779 A CN 104724779A CN 201510167296 A CN201510167296 A CN 201510167296A CN 104724779 A CN104724779 A CN 104724779A
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China
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tube
flue gas
heat exchanger
neat stress
outlet
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CN201510167296.0A
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Chinese (zh)
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CN104724779B (en
Inventor
范庆伟
姚明宇
李红智
张立欣
吴帅帅
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Xian Thermal Power Research Institute Co Ltd
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Xian Thermal Power Research Institute Co Ltd
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Abstract

The invention discloses a clean flue gas recycling type desulfurization waste water spraying system comprising a clean flue gas recycling passage, a recycling fan, a tube-and-shell heat exchanger, a spraying evaporating column, a desulfurization waste water pipe, and a bypass flue. The recycling fan, the tube-and-shell heat exchanger and the spraying evaporating column are mounted in order behind the clean flue gas recycling passage. The desulfurization waste water pipe is communicated with the spraying evaporating column. The bypass flue is mounted between a boiler and an air preheater and is communicated with a raw flue gas inlet of the tube-and-shell heat exchanger. An outlet, for raw flue gas subjected to heat exchanging, of the tube-and-shell heat exchanger is communicated with an outlet of the air preheater and an outlet of the spraying evaporating column and is then connected to an inlet of an electric precipitator; an outlet of the electric precipitator is communicated with a desulfurization column and a draught fan in order. The system is applied to heating and spraying the desulfurization waste water, so that the evaporated clean flue gas is hot and dust free, evaporating speed is high, and dust caking rarely occurs; the hot flue gas and the desulfurization waste water are sprayed and evaporated in an independent reaction container, low influence is caused to the original system, and start-stop and maintenance are facilitated.

Description

Neat stress recirculation type desulfurization wastewater spraying treatment system
Technical field
The present invention relates to thermal power generating technology field, be specifically related to a kind of neat stress recirculation type desulfurization wastewater spraying treatment system.
Background technology
Since 2014, China further increases coal-burning power plant SO 2, NO xand the emission standard of flue dust, reach the level being better than international advanced standard.In order to realize the management goal of pollutent, traditional single-stage thionizer is arranged often can not meet chimney breast SO 2emission concentration is no more than 35mg/m 3limit value, and series connection secondary tower or the decoration form of secondary tower in parallel need be adopted.In addition, desulphurization system needs round-the-clock running, to meet the needs of environmental administration's real time data monitoring.Normally run and the needs of material balance in system for meeting desulphurization system, system at regular intervals discharge desulfurization wastewater, according to different power plant desulphurization system operational conditions, unit load practical situation, wastewater discharge difference is comparatively large, from 5m 3/ h to 100m 3/ h is not etc.The general water temperature of desulfurization wastewater is at 40 DEG C ~ 50 DEG C, and its water quality saltiness is high, and generally about 3%, and the water quality inferiority opposite sex is large, has the feature such as severe corrosive and easy fouling.Current power plant generally adopts three header process to desulfurization wastewater, removes heavy metals and suspended substance, is discharged into grey field or coal yard after process.
In recent years, in order to saving water resource and preventing water pollution, many thermal power plants require by the waste water zero emission design of full factory.The technique of existing realization " zero release " generally adopts brine concentration to evaporate and crystallization technique carries out advanced treatment.The waste water of 95% can be converted into high purity distilled water, and the high quality distilled water of generation can be used for boiler replenishing water, cooling tower moisturizing, other process waters etc.; Remaining 5% is high density slurries, small-sized pond of tanning by the sun can be delivered to evaporate, or solid particulate is processed in crystallizer or spray-dryer, final salinity residue solid is generally used as ordinary solid waste, according to its composition recoverable or the method process such as to bury.This investment in machinery and equipment cost is high, and working cost is high, ton water treatment expense unit up to a hundred, and the power plant that the whole world adopts this technology to carry out desulfurization wastewater process only has about 5.
Spraying dry is the method for fluidization technique for liquid material drying.It, after liquid material is concentrated into suitable density, makes it be atomized into fine mist, carries out heat exchange, moisture is evaporated rapidly with the hot gas flow of certain flow rate, the powdered or granular method of dry materials.Mix with heat smoke after tail end wastewater atomization, utilize the waste heat of flue gas to make moisture rapid evaporation, the salt in water can crystallization formation particulate matter trap along with flue gas enters electric precipitator.
For above-mentioned spray evaporation technology, as directly sprayed after desulfurization wastewater atomization in the former flue gas of people's high temperature (between 150 ~ 380 DEG C), then drop can form accumulated ash into lump in evaporative process on flue wall, not only affect the operability of equipment, also can cause the increase of unit flue resistance, time serious, need blowing out deashing.Therefore, the accumulated ash into lump in desulfurization wastewater evaporative process is avoided to be the major issue that spray evaporation technology needs to solve.
Summary of the invention
In order to effectively avoid the accumulated ash into lump problem produced in desulfurization wastewater spray evaporation process, the object of the present invention is to provide a kind of neat stress recirculation type desulfurization wastewater spraying treatment system, induced draft fan is utilized to export part recirculation neat stress and the front former flue gas heat exchange in tube and shell heat exchanger of drawing of air preheater of extraction, afterwards the recirculation neat stress through heating is carried out contact heat exchange with desulfurization wastewater in spray evaporation tower, realize the evaporation of desulfurization wastewater, the salt particle of separating out after evaporation is heated before neat stress is carried at electric precipitator to be mixed with former flue gas, and be captured in electric precipitation.In this system for heat desulfurization wastewater flue gas in hardly containing dust, therefore accumulated ash into lump problem is fundamentally solved, waste water after process enters desulphurization system, the salt particle of precipitation is trapped by fly-ash separator, thus achieves real desulfurization wastewater " zero release ".
To achieve these goals, the technical scheme that the present invention takes is:
Neat stress recirculation type desulfurization wastewater spraying treatment system, comprise the neat stress recirculating gas duct 10 be arranged on induced draft fan 8 exhaust pass, be installed on the recirculation blower 11 after neat stress recirculating gas duct 10 successively, for the tube and shell heat exchanger 12 that heats recirculation neat stress and the spray evaporation tower 5 for evaporating desulfurization wastewater be communicated with tube and shell heat exchanger 12 by high temperature neat stress flue 3, the desulfurization wastewater pipeline 4 be communicated with spray evaporation tower 5; Be arranged on the bypass flue 13 as heating medium extraction channel between boiler 1 and air preheater 2, bypass flue 13 is connected with the former smoke inlet of tube and shell heat exchanger 12, access electric precipitator 6 entrance after the outlet of former exhanst gas outlet and air preheater 2 and the outlet of spray evaporation tower 5 after the heat exchange of tube and shell heat exchanger 12, electric precipitator 6 exports and is communicated with thionizer 7 and induced draft fan 8 successively; Low temperature neat stress in described tube and shell heat exchanger 12 is at Bottomhole pressure, and dust-laden high-temperature flue gas is at the outer transversal flow of pipe; Neat stress in described spray evaporation tower 5 and desulfurization wastewater are sprayed direct contact heat transfer.
Compared to the prior art, tool has the following advantages in the present invention:
Adopt after present system, realize the neat stress temperature of evaporation for heating atomization desulfurization wastewater high and not containing dust, there is vaporator rate fast, the not easily advantage of accumulated ash into lump.Heat smoke and desulfurization wastewater carry out spray evaporation in independent reaction vessel, less on original system impact, can start and stop easily and maintenance.
Accompanying drawing explanation
Accompanying drawing is structural representation of the present invention.
Wherein, 1 is boiler, and 2 is air preheater, 3 is high temperature neat stress flue, and 4 is desulfurization wastewater pipeline, and 5 is spray evaporation tower, 6 is electric precipitator, 7 is thionizer, and 8 is induced draft fan, and 9 is chimney, 10 is neat stress recirculating gas duct, 11 is recirculation blower, and 12 is tube and shell heat exchanger, and 13 is bypass flue.
Embodiment
Below in conjunction with drawings and the specific embodiments, the present invention is described in further detail.
As shown in drawings, neat stress recirculation type desulfurization wastewater spraying treatment system of the present invention, comprise the neat stress recirculating gas duct 10 be arranged on induced draft fan 8 exhaust pass, be installed on the recirculation blower 11 after neat stress recirculating gas duct 10 successively, for the tube and shell heat exchanger 12 that heats recirculation neat stress and the spray evaporation tower 5 for evaporating desulfurization wastewater be communicated with tube and shell heat exchanger 12 by high temperature neat stress flue 3, the desulfurization wastewater pipeline 4 be communicated with spray evaporation tower 5; Be arranged on the bypass flue 13 as heating medium extraction channel between boiler 1 and air preheater 2, bypass flue 13 is connected with the former smoke inlet of tube and shell heat exchanger 12, access electric precipitator 6 entrance after the outlet of former exhanst gas outlet and air preheater 2 and the outlet of spray evaporation tower 5 after the heat exchange of tube and shell heat exchanger 12, electric precipitator 6 exports and is communicated with thionizer 7 and induced draft fan 8 successively; Low temperature neat stress in described tube and shell heat exchanger 12 is at Bottomhole pressure, and dust-laden high-temperature flue gas is at the outer transversal flow of pipe; Neat stress in described spray evaporation tower 5 and desulfurization wastewater are sprayed direct contact heat transfer.
As shown in drawings, principle of work of the present invention is: the former flue gas that boiler 1 produces is before entering air preheater 2, distribute a part through bypass flue 13 and enter tube and shell heat exchanger 12, former flue gas is at the outer transversal flow of pipe, recirculation neat stress in heating tube, the flue gas former in remaining before electric precipitator 6 of the former flue gas after heat exchange mixes and together enters electric precipitator 6.Recirculation neat stress is drawn by the neat stress recirculating gas duct 10 of recirculation blower 11 through arranging between induced draft fan 8 and chimney 9, and sends into tube and shell heat exchanger 12.Being sent in spray evaporation tower 5 by high temperature neat stress flue 3 by the neat stress that heats and carry out contact heat exchange with the desulfurization wastewater introduced through desulfurization wastewater pipeline 4, the salt particle of the water vapor after evaporation and precipitation mix with all former flue gases before being carried at electric precipitator 6 by neat stress and also finally enters electric precipitator 6.The salt particle of separating out is trapped by electric precipitator 6, is then entered thionizer 7 condensation with flue gas, thus achieve desulfurization wastewater " zero release " truly by the desulfurization wastewater water vapor be evaporated.

Claims (1)

1. neat stress recirculation type desulfurization wastewater spraying treatment system, it is characterized in that: comprise the neat stress recirculating gas duct (10) be arranged on induced draft fan (8) exhaust pass, be installed on the recirculation blower (11) after neat stress recirculating gas duct (10) successively, for the tube and shell heat exchanger (12) that heats recirculation neat stress and the spray evaporation tower (5) for evaporating desulfurization wastewater be communicated with tube and shell heat exchanger (12) by high temperature neat stress flue (3), the desulfurization wastewater pipeline (4) be communicated with spray evaporation tower (5), be arranged on the bypass flue as heating medium extraction channel (13) between boiler (1) and air preheater (2), bypass flue (13) is connected with the former smoke inlet of tube and shell heat exchanger (12), access electric precipitator (6) entrance after the outlet of former exhanst gas outlet and air preheater (2) and the outlet of spray evaporation tower (5) after the heat exchange of tube and shell heat exchanger (12), electric precipitator (6) outlet is communicated with thionizer (7) and induced draft fan (8) successively, low temperature neat stress in described tube and shell heat exchanger (12) is at Bottomhole pressure, and dust-laden high-temperature flue gas is at the outer transversal flow of pipe, neat stress in described spray evaporation tower (5) and desulfurization wastewater are sprayed direct contact heat transfer.
CN201510167296.0A 2015-04-09 2015-04-09 Neat stress recirculation type desulfurization wastewater spraying treatment system Expired - Fee Related CN104724779B (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105417604A (en) * 2016-01-18 2016-03-23 重庆远达水务有限公司 Method and device using fume residual heat to treat desulfurization waste water
CN105668672A (en) * 2016-04-13 2016-06-15 亿川科技(成都)有限责任公司 Coal-fired boiler bypass flue wastewater evaporation device and technology
CN108117122A (en) * 2016-11-29 2018-06-05 中国石油化工股份有限公司 A kind of processing method and processing unit of sodium method flue gas desulfurization waste-water
CN105692745B (en) * 2016-03-02 2018-07-24 浙江浙能技术研究院有限公司 A kind of hybrid flue gas is evaporated desulfurization wastewater device and method
CN109059027A (en) * 2018-08-27 2018-12-21 山东电力工程咨询院有限公司 A kind of high-temperature biomass gas is cooling and the system and method for UTILIZATION OF VESIDUAL HEAT IN
CN109139158A (en) * 2018-08-06 2019-01-04 山东电力工程咨询院有限公司 Utilize the system and method for biogas sensible heat and smoke evaporative emission reduction desulfurization wastewater

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103936220A (en) * 2014-05-06 2014-07-23 田晓良 Zero discharge treatment process of saline sewage produced by refining
CN104399363A (en) * 2014-12-02 2015-03-11 成都华西堂投资有限公司 Waste recycling and regenerating device used in flue gas purification method
CN204569462U (en) * 2015-04-09 2015-08-19 西安热工研究院有限公司 Neat stress recirculation type desulfurization wastewater spraying treatment unit

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103936220A (en) * 2014-05-06 2014-07-23 田晓良 Zero discharge treatment process of saline sewage produced by refining
CN104399363A (en) * 2014-12-02 2015-03-11 成都华西堂投资有限公司 Waste recycling and regenerating device used in flue gas purification method
CN204569462U (en) * 2015-04-09 2015-08-19 西安热工研究院有限公司 Neat stress recirculation type desulfurization wastewater spraying treatment unit

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105417604A (en) * 2016-01-18 2016-03-23 重庆远达水务有限公司 Method and device using fume residual heat to treat desulfurization waste water
CN105692745B (en) * 2016-03-02 2018-07-24 浙江浙能技术研究院有限公司 A kind of hybrid flue gas is evaporated desulfurization wastewater device and method
CN105668672A (en) * 2016-04-13 2016-06-15 亿川科技(成都)有限责任公司 Coal-fired boiler bypass flue wastewater evaporation device and technology
CN105668672B (en) * 2016-04-13 2019-03-12 亿川科技(成都)有限责任公司 A kind of coal-burning boiler bypass flue waste evaporator plant and technique
CN108117122A (en) * 2016-11-29 2018-06-05 中国石油化工股份有限公司 A kind of processing method and processing unit of sodium method flue gas desulfurization waste-water
CN108117122B (en) * 2016-11-29 2021-03-05 中国石油化工股份有限公司 Treatment method and treatment device for sodium-method flue gas desulfurization wastewater
CN109139158A (en) * 2018-08-06 2019-01-04 山东电力工程咨询院有限公司 Utilize the system and method for biogas sensible heat and smoke evaporative emission reduction desulfurization wastewater
CN109139158B (en) * 2018-08-06 2021-04-20 山东电力工程咨询院有限公司 System and method for reducing emission of desulfurization wastewater by using sensible heat of biomass gas and flue gas evaporation
CN109059027A (en) * 2018-08-27 2018-12-21 山东电力工程咨询院有限公司 A kind of high-temperature biomass gas is cooling and the system and method for UTILIZATION OF VESIDUAL HEAT IN

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